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/*
Copyright (C) 2015 by Bernd Buschinski <b.buschinski@gmail.com>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "jack-wrapper.h"
#include <util/threading.h>
#include <stdio.h>
#include <util/platform.h>
#define blog(level, msg, ...) blog(level, "jack-input: " msg, ##__VA_ARGS__)
/**
* Get obs speaker layout from number of channels
*
* @param channels number of channels reported by jack
*
* @return obs speaker_layout id
*
* @note This *might* not work for some rather unusual setups, but should work
* fine for the majority of cases.
*/
static enum speaker_layout jack_channels_to_obs_speakers(uint_fast32_t channels)
{
switch (channels) {
case 1:
return SPEAKERS_MONO;
case 2:
return SPEAKERS_STEREO;
case 3:
return SPEAKERS_2POINT1;
case 4:
return SPEAKERS_4POINT0;
case 5:
return SPEAKERS_4POINT1;
case 6:
return SPEAKERS_5POINT1;
/* What should we do with 7 channels? */
/* case 7: return SPEAKERS_...; */
case 8:
return SPEAKERS_7POINT1;
}
return SPEAKERS_UNKNOWN;
}
int jack_process_callback(jack_nframes_t nframes, void *arg)
{
struct jack_data *data = (struct jack_data *)arg;
jack_nframes_t current_frames;
jack_time_t current_usecs, next_usecs;
float period_usecs;
uint64_t now = os_gettime_ns();
if (data == 0)
return 0;
struct obs_source_audio out;
out.speakers = jack_channels_to_obs_speakers(data->channels);
out.samples_per_sec = jack_get_sample_rate(data->jack_client);
/* format is always 32 bit float for jack */
out.format = AUDIO_FORMAT_FLOAT_PLANAR;
for (unsigned int i = 0; i < data->channels; ++i) {
jack_default_audio_sample_t *jack_buffer =
(jack_default_audio_sample_t *)jack_port_get_buffer(
data->jack_ports[i], nframes);
out.data[i] = (uint8_t *)jack_buffer;
}
out.frames = nframes;
if (!jack_get_cycle_times(data->jack_client, ¤t_frames,
¤t_usecs, &next_usecs, &period_usecs)) {
out.timestamp = now - (int64_t)(period_usecs * 1000);
} else {
out.timestamp = now - util_mul_div64(nframes, 1000000000ULL,
data->samples_per_sec);
blog(LOG_WARNING,
"jack_get_cycle_times error: guessing timestamp");
}
/* FIXME: this function is not realtime-safe, we should do something
* about this */
obs_source_output_audio(data->source, &out);
return 0;
}
int_fast32_t jack_init(struct jack_data *data)
{
pthread_mutex_lock(&data->jack_mutex);
if (data->jack_client != NULL)
goto good;
jack_options_t jack_option =
data->start_jack_server ? JackNullOption : JackNoStartServer;
data->jack_client = jack_client_open(data->device, jack_option, 0);
if (data->jack_client == NULL) {
blog(LOG_ERROR,
"jack_client_open Error:"
"Could not create JACK client! %s",
data->device);
goto error;
}
data->jack_ports =
(jack_port_t **)bzalloc(sizeof(jack_port_t *) * data->channels);
for (unsigned int i = 0; i < data->channels; ++i) {
char port_name[10] = {'\0'};
snprintf(port_name, sizeof(port_name), "in_%u", i + 1);
data->jack_ports[i] = jack_port_register(
data->jack_client, port_name, JACK_DEFAULT_AUDIO_TYPE,
JackPortIsInput | JackPortIsTerminal, 0);
if (data->jack_ports[i] == NULL) {
blog(LOG_ERROR,
"jack_port_register Error:"
"Could not create JACK port! %s",
port_name);
goto error;
}
}
if (jack_set_process_callback(data->jack_client, jack_process_callback,
data) != 0) {
blog(LOG_ERROR, "jack_set_process_callback Error");
goto error;
}
if (jack_activate(data->jack_client) != 0) {
blog(LOG_ERROR, "jack_activate Error:"
"Could not activate JACK client!");
goto error;
}
good:
pthread_mutex_unlock(&data->jack_mutex);
return 0;
error:
pthread_mutex_unlock(&data->jack_mutex);
return 1;
}
void deactivate_jack(struct jack_data *data)
{
pthread_mutex_lock(&data->jack_mutex);
if (data->jack_client) {
jack_client_close(data->jack_client);
if (data->jack_ports != NULL) {
bfree(data->jack_ports);
data->jack_ports = NULL;
}
data->jack_client = NULL;
}
pthread_mutex_unlock(&data->jack_mutex);
}
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